error - True or False: GIS specialists should remove all...

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True or False: GIS specialists should remove all error from a dataset before beginning a GIS application.
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The error component of spatial databases can be managed for but never eliminated: Limits to measurement Limits to resources/people Indefinite boundaries of some spatial phenomena Things change
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Cost E r r o r } error never reaches zero Cost of data acquisition increases exponentially with increased accuracy. New technologies (e.g., GPS) may “flatten the curve” but don’t the change basic relation between error reduction and cost.
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Sources of error- Measurement error (apparatus/observer/environment) Field data- sampling strategy, quality of field techniques employed Laboratory Positional accuracy (e.g., GPS) Natural spatial variation (indeterminate boundaries) Change over time
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Error management may include: The design and implementation of data collection efforts such that total error is less than some predetermined amount e.g., guidelines for surveyors. An understanding of the impact of error on a particular analysis, i.e., tolerance to error should be examined in the context of a particular use/objective e.g., the needs of the planning department may differ from the needs f the engineering department.
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Error management may include: An understanding of the spatial distribution of the phenomenon of interest, e.g., many geographical features do not possess distinct boundaries, how do you go about
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This note was uploaded on 04/01/2012 for the course 044 005 taught by Professor Davidbennett during the Fall '11 term at University of Iowa.

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error - True or False: GIS specialists should remove all...

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